2006/02/06 by Y. Shiotani, J. L. Sarrao, Guo-qing Zheng · 1 citation
Materials Science · Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Colossal magnetoresistance #Condensed matter physics #Curie temperature #Ferromagnetism #Field (mathematics) #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetoresistance #Materials science #Mathematics #Order (exchange) #Physics #Quantum mechanics #Rare-earth and actinide compounds #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.96.057203
published as Phys. Rev. Lett. 96, 057203 (2006)
openalex publication_date 2006/02/06 · arxiv created 2006/02/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In order to gain insights into the origin of colossal magnetoresistance (CMR) in manganese oxides, we performed a 139La NMR study in the double-layered compound La1.2Sr1.8Mn2O7. We find that above the Curie temperature TC=126 K, applying a magnetic field induces a long-range ferromagnetic order that persists up to T=330 K. The critical field at which the induced magnetic moment is saturated coincides with the field at which the CMR effect reaches a maximum. Our results therefore indicate that the CMR observed above TC in this compound is due to the field-induced ferromagnetism that produces a metallic state via the double exchange interaction.